This is just a cache for E9x M3 brake rotor dimensions/information I'm posting for posterity, there won't be much interesting to see here, honestly. Non-OEM front and rear 2-piece E9x rotors can be sourced from RacingBrake, details in this thread. I loathe the duplication of information, but for this, it's not always a bad thing, and it may be of more use m3post than m3forum.net.